Warning - Old Content
This post is quite old, and it might not apply anymore, or maybe there's a better way to do the same thing nowadays. Take with a big grain of salt.
In Ubuntu Lucid, there is apparently an infrequent problem with NetworkManager not coming back properly when waking up a laptop from sleep/hibernate. Even though it seemed like the wireless driver was somehow no longer working, it was actually due to an inconsistent state being saved/restored. No amount of stopping/restarting services or reloading modules helped, since the config claimed to be working as expected.
The basic fix:
- Change the
NetworkingEnabledline to be:
- Restart networkmanager:
sudo service network-manager restart
It would be very helpful if KNetworkManager provided a GUI way to detect/fix this - I may have a go at adding it.